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VOLUME 72 (2000) | ISSUE 10 | PAGE 691
A new mechanism for single spin asymmetries in strong interactions
PACS: 12.39.-x, 13.60.Hb, 14.65.-q, 14.70.Dj
It is shown that the contribution of the instantons to the fragmentation of quarks leads to the appearance of a imaginary part in diagrams of quark-quark scattering at large transfer momentum. The imaginary part comes from the analytical continuation of the instanton amplitudes from Euclidean to Minkowsky space-time and reflects quasiclassical origin of instanton solution of QCD equations of motion. This phenomenon and instanton-induced quark spin-flip give a new nonperturbative mechanism for the observed anomalous single-spin asymmetries in hadron-hadron and lepton-hadron interactions.